Since I figure not everyone's clued in about the whole "infected" thing, you should know that, first off, all that are infected right now have been noted as such on the workshop. Hopefully this explination will help provide some background info:
A bunch of the heroes, not in London and not in the Jupiter bit, were at the Haunted House of Heroes, where the Dust was collecting. The Dust is the "mother" of Darkside and of Morthrandur. It's shtick is essentially offering great power at the cost of whatever they value the most. Usually, it's just a bunch of dust, and it swirls on people, making this offer, and either they refuse or accept and become figures like Darkside or Morthrandur. It DOESN'T mean they turn evil (if they value evil the most for instance), just sort of give up whatever they valued the most before. For characters like Mr. Stafford, it is a bit redundant, because he's just an *** who values little to nothing. Those heroes (Ford, Mimiru, etc.) cleaned up most of the Dust, but didn't bother cleaning it all up, so now they're "infected" which probably means it's a slower, less drastic change/temptation deal.
Also, keep in mind that this infection element is mostly just here to complicate the story, to screw with the good guys even more. It's unlikely the infection will "spread" though it's pretty likely that the Dust will live on, to collect elsewhere and become a threat whenever we writers feel like it (which may be never). In any case, it'd be very difficult to spread the infection -- someone would have to get really close to you, via healing or transfusing of blood or bodily fluids, or staying at their place and not cleaning up after yourself...
(The Haunted House of Heroes might getting Dust-filled again <_<).
Keep in mind too that this effect of gaining power and becoming people they are not is suppose to be very subtle. All about the subtlety.
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